<template>
  <section class="todoapp">
    <!-- header -->
    <header class="header">
      <input
        class="new-todo"
        autocomplete="off"
        placeholder="Todo List"
        @keyup.enter="addTodo"
      >
    </header>
    <!-- main section -->
    <section
      v-show="todos.length"
      class="main"
    >
      <input
        id="toggle-all"
        :checked="allChecked"
        class="toggle-all"
        type="checkbox"
        @change="toggleAll({done: !allChecked})"
      >
      <label for="toggle-all" />
      <ul class="todo-list">
        <todo
          v-for="(todo, index) in filteredTodos"
          :key="index"
          :todo="todo"
          @toggleTodo="toggleTodo"
          @editTodo="editTodo"
          @deleteTodo="deleteTodo"
        />
      </ul>
    </section>
    <!-- footer -->
    <footer
      v-show="todos.length"
      class="footer"
    >
      <span class="todo-count">
        <strong>{{ remaining }}</strong>
        {{ remaining | pluralize('item') }} left
      </span>
      <ul class="filters">
        <li
          v-for="(val, key) in filters"
          :key="key"
        >
          <a
            :class="{selected: visibility === key}"
            @click.prevent="visibility = key"
          >{{ key | capitalize }}</a>
        </li>
      </ul>
      <!-- <button class="clear-completed" v-show="todos.length > remaining" @click="clearCompleted">
        Clear completed
      </button> -->
    </footer>
  </section>
</template>

<script lang="ts">
import { Component, Vue } from 'vue-property-decorator'
import Todo, { ITodo } from './Todo.vue'

const STORAGE_KEY = 'todos'
const filters: { [ key: string ]: Function } = {
  all: (todos: ITodo[]) => todos,
  active: (todos: ITodo[]) => todos.filter(todo => !todo.done),
  completed: (todos: ITodo[]) => todos.filter(todo => todo.done)
}
const defalutList = [
  { text: 'star this repository', done: false },
  { text: 'fork this repository', done: false },
  { text: 'follow author', done: false },
  { text: 'vue-typescript-admin-template', done: true },
  { text: 'vue', done: true },
  { text: 'element-ui', done: true },
  { text: 'axios', done: true },
  { text: 'webpack', done: true }
]

@Component({
  name: 'TodoList',
  components: {
    Todo
  },
  filters: {
    pluralize: (n: number, s: string) => n === 1 ? s : s + 's',
    capitalize: (s: string) => s.charAt(0).toUpperCase() + s.slice(1)
  }
})
export default class extends Vue {
  private visibility = 'all'
  private todos = defalutList

  get allChecked() {
    return this.todos.every(todo => todo.done)
  }

  get filters() {
    return filters
  }

  get filteredTodos() {
    return filters[this.visibility](this.todos)
  }

  get remaining() {
    return this.todos.filter(todo => !todo.done).length
  }

  private setLocalStorage() {
    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(this.todos))
  }

  private addTodo(e: KeyboardEvent) {
    const text = (e.target as HTMLInputElement).value
    if (text.trim()) {
      this.todos.push({
        text,
        done: false
      })
      this.setLocalStorage()
    }
    (e as any).target.value = ''
  }

  private toggleTodo(todo: ITodo) {
    todo.done = !todo.done
    this.setLocalStorage()
  }

  private deleteTodo(todo: ITodo) {
    this.todos.splice(this.todos.indexOf(todo), 1)
    this.setLocalStorage()
  }

  private editTodo({ todo, value }: { todo: ITodo, value: string }) {
    todo.text = value
    this.setLocalStorage()
  }

  private clearCompleted() {
    this.todos = this.todos.filter(todo => !todo.done)
    this.setLocalStorage()
  }

  private toggleAll({ done }: { done: boolean }) {
    this.todos.forEach(todo => {
      todo.done = done
      this.setLocalStorage()
    })
  }
}
</script>

<style lang="scss" scope>
.todoapp {
  font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.4em;
  color: #4d4d4d;
  min-width: 230px;
  max-width: 550px;
  margin: 0 auto ;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-weight: 300;
  background: #fff;
  z-index: 1;
  position: relative;

  button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    font-size: 100%;
    vertical-align: baseline;
    font-family: inherit;
    font-weight: inherit;
    color: inherit;
    -webkit-appearance: none;
    appearance: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  :focus {
    outline: 0;
  }

  .hidden {
    display: none;
  }

  .todoapp {
    background: #fff;
    margin: 130px 0 40px 0;
    position: relative;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
  }

  .todoapp input::-webkit-input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
  }

  .todoapp input::-moz-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
  }

  .todoapp input::input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
  }

  .todoapp h1 {
    position: absolute;
    top: -155px;
    width: 100%;
    font-size: 100px;
    font-weight: 100;
    text-align: center;
    color: rgba(175, 47, 47, 0.15);
    -webkit-text-rendering: optimizeLegibility;
    -moz-text-rendering: optimizeLegibility;
    text-rendering: optimizeLegibility;
  }

  .new-todo,
  .edit {
    position: relative;
    margin: 0;
    width: 100%;
    font-size: 18px;
    font-family: inherit;
    font-weight: inherit;
    line-height: 1.4em;
    border: 0;
    color: inherit;
    padding: 6px;
    border: 1px solid #999;
    box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  .new-todo {
    padding: 10px 16px 16px 60px;
    border: none;
    background: rgba(0, 0, 0, 0.003);
    box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
  }

  .main {
    position: relative;
    z-index: 2;
    border-top: 1px solid #e6e6e6;
  }

  .toggle-all {
    text-align: center;
    border: none;
    /* Mobile Safari */
    opacity: 0;
    position: absolute;
  }

  .toggle-all+label {
    width: 60px;
    height: 34px;
    font-size: 0;
    position: absolute;
    top: -52px;
    left: -13px;
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
  }

  .toggle-all+label:before {
    content: '❯';
    font-size: 22px;
    color: #e6e6e6;
    padding: 10px 27px 10px 27px;
  }

  .toggle-all:checked+label:before {
    color: #737373;
  }

  .todo-list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .todo-list li {
    position: relative;
    font-size: 24px;
    border-bottom: 1px solid #ededed;
  }

  .todo-list li:last-child {
    border-bottom: none;
  }

  .todo-list li.editing {
    border-bottom: none;
    padding: 0;
  }

  .todo-list li.editing .edit {
    display: block;
    width: 506px;
    padding: 12px 16px;
    margin: 0 0 0 43px;
  }

  .todo-list li.editing .view {
    display: none;
  }

  .todo-list li .toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
    border: none;
    /* Mobile Safari */
    -webkit-appearance: none;
    appearance: none;
  }

  .todo-list li .toggle {
    opacity: 0;
  }

  .todo-list li .toggle+label {
    /*
    Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
    IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
  */
    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
    background-repeat: no-repeat;
    background-position: center left;
    background-size: 36px;
  }

  .todo-list li .toggle:checked+label {
    background-size: 36px;
    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
  }

  .todo-list li label {
    word-break: break-all;
    padding: 15px 15px 15px 50px;
    display: block;
    line-height: 1.0;
        font-size: 14px;
    transition: color 0.4s;
  }

  .todo-list li.completed label {
    color: #d9d9d9;
    text-decoration: line-through;
  }

  .todo-list li .destroy {
    display: none;
    position: absolute;
    top: 0;
    right: 10px;
    bottom: 0;
    width: 40px;
    height: 40px;
    margin: auto 0;
    font-size: 30px;
    color: #cc9a9a;
    transition: color 0.2s ease-out;
    cursor: pointer;
  }

  .todo-list li .destroy:hover {
    color: #af5b5e;
  }

  .todo-list li .destroy:after {
    content: '×';
  }

  .todo-list li:hover .destroy {
    display: block;
  }

  .todo-list li .edit {
    display: none;
  }

  .todo-list li.editing:last-child {
    margin-bottom: -1px;
  }

  .footer {
    color: #777;
    position: relative;
    padding: 10px 15px;
    height: 40px;
    text-align: center;
    border-top: 1px solid #e6e6e6;
  }

  .footer:before {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 40px;
    overflow: hidden;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 8px 0 -3px #f6f6f6, 0 9px 1px -3px rgba(0, 0, 0, 0.2), 0 16px 0 -6px #f6f6f6, 0 17px 2px -6px rgba(0, 0, 0, 0.2);
  }

  .todo-count {
    float: left;
    text-align: left;
  }

  .todo-count strong {
    font-weight: 300;
  }

  .filters {
    margin: 0;
    padding: 0;
    position: relative;
    z-index: 1;
    list-style: none;
  }

  .filters li {
    display: inline;
  }

  .filters li a {
    color: inherit;
    font-size: 12px;
    padding: 3px 7px;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 3px;
  }

  .filters li a:hover {
    border-color: rgba(175, 47, 47, 0.1);
  }

  .filters li a.selected {
    border-color: rgba(175, 47, 47, 0.2);
  }

  .clear-completed,
  html .clear-completed:active {
    float: right;
    position: relative;
    line-height: 20px;
    text-decoration: none;
    cursor: pointer;
  }

  .clear-completed:hover {
    text-decoration: underline;
  }

  .info {
    margin: 65px auto 0;
    color: #bfbfbf;
    font-size: 10px;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
    text-align: center;
  }

  .info p {
    line-height: 1;
  }

  .info a {
    color: inherit;
    text-decoration: none;
    font-weight: 400;
  }

  .info a:hover {
    text-decoration: underline;
  }

  /*
  Hack to remove background from Mobile Safari.
  Can't use it globally since it destroys checkboxes in Firefox
*/
  @media screen and (-webkit-min-device-pixel-ratio:0) {
    .toggle-all,
    .todo-list li .toggle {
      background: none;
    }

    .todo-list li .toggle {
      height: 40px;
    }
  }

  @media (max-width: 430px) {
    .footer {
      height: 50px;
    }
  }
}
</style>
